CD Based games can't autosave/resume #7

doesn't fix the issue specific issues that were found, those are
pre-existing from MiniUI, but ensures datetime recorded, and sync is
performed prior to poweroff for write security.
probably need swap file to prevent segfault found on segacd autoresume

skeleton/.system/bin/shutdown

@@ -3,4 +3,4 @@
 if [ -n "$DATETIME_PATH" ]; then
 	echo `date +'%F %T'` > "$DATETIME_PATH"
 fi
-sync && reboot && sleep 10
+sync && poweroff && sleep 10

src/batmon/batmon.c

@@ -107,7 +107,7 @@ int main(void) {
 	close(fb0_fd);
 
 	if (!launch) {
-		system("poweroff");
+		system("shutdown");
 		while (1) pause();
 	}
 

src/common/common.c

@@ -856,7 +856,7 @@ void powerOff(void) {
 		GFX_blitBodyCopy(screen, msg, 0,0,Screen.width,Screen.height);
 		SDL_Flip(screen);
 		sleep(1);
-		system("poweroff");
+		system("shutdown");
 		while (1) pause();
 	}
 }

src/keymon/keymon.c

@@ -217,7 +217,7 @@ int main (int argc, char *argv[]) {
 
 		if (menu_pressed && power_pressed) {
 			menu_pressed = power_pressed = 0;
-			system("poweroff");
+			system("shutdown");
 			while (1) pause();
 		}
 	}